First slide

Regulation of Gene Expression

Question

The i gene in lac operon synthesises:

Easy

A

Catalytic protein mainly responsible for hydrolysis of disaccharide
B

Protein constitutively
C

Enzymes that increases permeability of the cells to β-galactosidase
D

Transferase that detoxifies the products of lactose metabolism

Solution

The i gene codes for the repressor of the lac operon. The repressor of the operon is synthesised (all-the-time – constitutively) from the i gene. The repressor protein binds to the operator region of the operon and prevents RNA polymerase from transcribing the operon.

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